Panasonic KT7 Instruction Manual page 3

• Connector: D-sub 9-pin
Connection: RS-232C
Host computer
Shielded
wire
D-sub 9-pin connector
• When connecting with PLC (RS-485)
Connection: RS-485
Shielded wire
Connect only one side of the shielded wire to the FG or GND terminal so that current cannot flow to
the shielded wire. (If both sides of the shielded wire are connected to the FG or GND terminal, the
circuit will be closed between the shielded wire and the ground. As a result, current will run through
the shielded wire and this may cause noise.) Be sure to ground FG and GND terminals.
Terminator (Terminal resistor)
Do not connect terminator with the communication line because each KT7 has built-in pull-up and
pull-down resistors instead of a terminator.
If there is a large distance between the PLC and the KT7, connect the terminator on the PLC side.
(Connect a terminator of 120
Setup of the KT7
• It is necessary to set the instrument number individually to the KT7 when communicating by
connecting plural units in serial communication.
Select a communication speed for the KT7 in accordance with that of the host computer.
• Refer to Chapter 1 "Setup of the KT7" for instrument number setting and communication speed
selection.
Memory life of the KT7
The memory can contain up to 1,000,000 (one million) set value entries.
This memory life is sufficient when the set value is changed by keypad operation.
However, when changing the set value frequently via the communication function, be careful not to
exceed the 1,000,000 (one million) cycles limit.
RS-485 (Communication speed: 2400, 4800, 9600, 19200bps)
FG
(Fig. 4-2)
RS-485 (Communication speed: 2400, 4800, 9600, 19200bps)
Use a RJ-11 type modular plug when
connecting to the cable
4
3
Communication cable
(Fig. 4-3)
or more resistance.)
Use a RJ-11 type modular plug when
connecting to the cable
4
3
1, 6
Communication cable
Connect Terminals 1 and 6 to COM.
Connect Terminal 3 to YB (+).
Connect Terminal 4 to YA (-).
.
KT7
Connect terminal 3 to YB (+)
Connect terminal 4 to YA (-)
3
.
KT7